Sound-reproducer.



PATENTED SEPT. 4, 1906. T. H. MACDONALD.

SOUND REPRODUGER.

APPLICATION FILED JAN.19. 1904;

FIG. 1.

the re roducer of a graphophone, one 0 THOMAS H. MACDONALD,

OF BRIDGEPORT, CONNECTICUT.

SOUND-REPRODUCER.

Specification of Letters Patent.

Patented Sept. a, wee.

. Application filed January 19,1904. swarm. 189,696.

To all whom, it may concern.-

Be it known that I, THOMAS H. MAonoN- ALD, of Bridgeport, Connecticut,have invented a new and useful Sound-Reproducer, which invention isfully set forth in the following specification.

1is 'nvention relates more particularly to and has for its objects theadaptation of what are called pivot-point reproducers for usewithrecords of'varying depth.

. Illustrations of pivotoint reproducers are iven in my prior aplications for patent, erial No. 153,143, fi ed April 17, 1903, and

Serial No. 187,295, filed'Dec'ember 31, 1903.

e improvements constituting the present invention can best be explainedin connection with the accompanying drawingsf to a movable pin tion, asshown Figure 1 is a cross-section of a'graphophone, showing thereproducer in operative position. Fig. 2 is a similar view of thecarriage and reproducer, the latter being raised out of contact with therecord. Fig. 3 is a similar view showing the recorder in place. Fig. 4'is a detail of the spring-plunger. Fig. 5 is a detail in cross-sectionof the sound-conveying chamber of the reproducer, and Fig. 6 is anenlarged detail of part of the reproducer.

The-carriage 6, feed-screw 7, lifting-lever 8, and lifter 9 are ofordinary or suitable construction. The carriage has, as usual, a

socket 10 to receive the recorder or"repro-v ducer. This socket containsat the bottom a fixed pin 12 and diametrically opposite there- 14,carried by a plunger 15, which is normally ressed downward by a spiralspring 16. The tubular chamber 17 of t e reproducer has on its upperside a hole or depression 18, which tapers upwardly, and at its lowerside a slot 19, which extglnds to the end of the chamber.

When the reproducer is in operative posiin Fig. 1, it is-freetooscillate laterally on anaxis coinc dent with the pins It is also freeto move up and down to accommodate itself'to re ularities in the surfaceof the record 20, hie in this case is shown as cylindrical in form. Thismotion is permitted by the flaring shape of the hole 18 and by thecurved s rface of the end of the tubular chamber 17 which enters thesocket.

0 remove the reproducer, plunger 15 is lifted permitting its withdrawal.

The recorder 21, Fig. 3, is pivoted at its 'a vertical axis.

I. ends within a ring 22, which fits tightly in the socket 10 and isalso provided with holes to receive.the'pins 12 14. The recorder maythus oscillate on a horizontal axis, but not on chamber 17 of thereproducer is a slotted piece or saddle 24, in w ich the lifter 9engages to raise the reproducer from the record, as shown in Fig. 2.

he slot in saddle center line of the re reducer. I

Heretofore the diaphragm 26 of the reproducer has been placed in a planetransverse to the axis of the conveying-tube 17 of the reproducer or ina plane parallel therewith. According to this invention the diaphragm 26and sound-chainber 27 are in a plane oblique to the tube 17, whichgives. superior acoustical results. The stylus-carrying arm or lever 28is attached to the diaphragm at one end and carries the stylus 29 at theother. Owing to the oblique arrangement of the diaphragm and therelative positions of the other parts, the stylus acts upon the recordin a line approximately erpendicular to the tangent at the oint ofcontact and perpen-- dieular to the lime of the diaphragm. The stylusarm or ever 28 is fulcrumed on pivotpoints 30, Fig. 6, as described inmy aforesaid Beneath the tubular applications; but the improvementsherein set forth are not limited to roducers, though in some arlyapplicable thereto.

cla1m- 1. The combination with the pivot-point reespects particuep1ntherein, a s the movable pin, ansound-conveying tube and a flaringhole for pins.

2. The combination with the in a tubular socket, of a fixed pin and amovabe pin therein, a spring-plunger carrying the movable pin, and arecorder pivoted in a ring which fits closely in said socket, said ringringplunger carrying a reproducer havin a provided with a .s otengagement with said having holes for engagemen t-b said ins..

The combination with t e soc et hav- 1 ing a fixed pin and a movablepin, of a reproducer supported when in and having freedom of motion intwo directions, a sl tted saddle beneath the reproducer, a lifterengaging in the slot of said saddle, a rid operating means for thelifter.

4. The combination of a sound-record with a sound-re producer having acasing, a sound- {1 guides the lift-er to the 9. carriage ha.v .ingatubular socket, of a fixed pin and a movab carriage havplace in' saidsocket conveying tube or ehmnher, a diaphragm dis- 1 posed V hiiqu =iy1o ihe tube or chamber, a 1 stylus-lever illhlulntfii between its endson i said casing and having one arm engaging the I diaphragm, and astylus on the other arm vi brating perpeiniiculur to the record.

5. The combination of a sound-record with a sound-reproducer havingacesing, ii soundconveying ube or ch amber, a'diaphregin disposedobliquely to the tube or chamber, a stylus-lever pivoted between itsends on said 1 easing and having one arm engaging the dia- )hragm, and astylus on the other arm v1- )l'atlng perpendicular to the record.

In testimony whereof I have signed this 15 THOMAS H. MACDONALD.

Witnesses:

O. A. GIBNER, A. B. KEOUGIL

